Thank you for your compassion !
Yes, I have the 00.06.04 version
tcpdump -nn -i tun_c_rut955_ovpn_client returns:
no such device exists
ip link show display for tun…client:
… mtu 1500 qdisc fq_code1 state UNKNOWN mode DEFAULT group default qlen 100
ip a display:
same line + link/none + inet 172.22.22.2/24 brd 172.22.22.255 scope global …
Note: solved for tcpdump, the name is too long: tun_c_rut955_ov must be written
Other question:
Shall I modify the route for the whole client and server PCs ?